公开(公告)号：US5493222A

公开(公告)日：1996-02-20

申请号：US56881

申请日：1993-05-05

申请人： Kazushi Shirai ,  Toshihiro Shinbo ,  Norio Takeda ,  Mitsuzo Arii

发明人： Kazushi Shirai ,  Toshihiro Shinbo ,  Norio Takeda ,  Mitsuzo Arii

IPC分类号： G01P3/36 ,  G01P3/486 ,  G01R33/032

CPC分类号： G01R33/0322 ,  G01P3/36 ,  G01P3/486

摘要： A reflection type magnetooptic sensor head. The respective structural elements are aligned in the order of a light source, light inputting/outputting path, polarizer, Faraday rotator, and reflecting film. The Faraday rotator is made of a (111) bismuth-substituted iron garnet single crystal film. The Faraday rotator is positioned such that the optical axis of the light incident upon the surface of the Faraday rotator makes an angle of 10 to 70 degrees with an axis normal to the surface of the Faraday rotator. The sensor head may further include two identical rectangular prisms positioned such that the Faraday rotator is sandwiched between the slanting surfaces of the prisms.

摘要翻译： 反射型磁光传感头。 各个结构元件按光源，光输入/输出路径，偏振器，法拉第旋转器和反射膜的顺序排列。 法拉第旋转器由（111）铋取代的铁石榴石单晶膜制成。 法拉第旋转器的定位使得入射到法拉第旋转器表面的光的光轴与法拉第转子表面垂直的轴形成10度至70度的角度。 传感器头还可以包括两个相同的矩形棱镜，这些棱镜定位成使得法拉第旋转器夹在棱镜的倾斜表面之间。

公开(公告)号：US5463316A

公开(公告)日：1995-10-31

申请号：US70684

申请日：1993-06-02

申请人： Kazushi Shirai ,  Toshihiro Shinbo ,  Norio Takeda ,  Mitsuzo Arii

发明人： Kazushi Shirai ,  Toshihiro Shinbo ,  Norio Takeda ,  Mitsuzo Arii

IPC分类号： G01R33/032 ,  G01R33/02

CPC分类号： G01R33/0322

摘要： A reflection type magnetooptic sensor head is disclosed. The respective structural elements are aligned following a light source in the order of a light inputting/outputting path, polarizer, Faraday rotator, and reflecting mirror. The Faraday rotator is made of a (111) bismuth-substituted iron garnet single crystal film having [111] axis at an angle of 5-60 degrees with an axis normal to the film surface. The reflecting mirror is positioned such that a light incident upon the reflecting mirror is substantially normal to the surface of the reflecting mirror.

摘要翻译： 公开了一种反射型磁光传感器头。 各个结构元件按照光输入/输出路径，偏振器，法拉第旋转器和反射镜的顺序在光源之后对准。 法拉第旋转器由（111）铋取代的铁石榴石单晶膜制成，其具有垂直于膜表面的轴线，角度为5-60度的[111]轴。 反射镜被定位成使得入射在反射镜上的光基本上垂直于反射镜的表面。

公开(公告)号：US4932760A

公开(公告)日：1990-06-12

申请号：US314927

申请日：1989-02-24

申请人： Mitsuzo Arii ,  Norio Takeda ,  Yasunori Tagami ,  Kazushi Shirai

发明人： Mitsuzo Arii ,  Norio Takeda ,  Yasunori Tagami ,  Kazushi Shirai

IPC分类号： G02F1/09 ,  C30B29/28 ,  H01F10/24

CPC分类号： H01F10/245 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12951

摘要： This invention provides a magneto-optic garnet grown by liquid phase epitaxy on a nonmagnetic garnet substrate and having a composition of the following formula (1)Ho.sub.x Tb.sub.y Bi.sub.3-x-y Fe.sub.5 O.sub.12 (1)wherein 0.3.ltoreq.y/x.ltoreq.1.0 and x+y

摘要翻译： 本发明提供了一种在非磁性石榴石衬底上通过液相外延生长并具有下式（1）HoxTbB3-x-yFe5O12（1）的组成的磁光石榴石，其中0.3≤y/x≤1.0和 x + y <3.0。 根据本发明，提供了一种用作光隔离器，光循环器等的法拉第旋转器的磁光石榴石，利用法拉第效应，其具有非常大的法拉第旋转系数，晶格常数与 非磁性石榴石基材，呈现镜面而不引起膜缺陷（或所谓的凹坑），并且具有较小的温度依赖性。

公开(公告)号：US5345329A

公开(公告)日：1994-09-06

申请号：US62552

申请日：1993-05-18

申请人： Kazushi Shirai ,  Toshihiko Takano ,  Norio Takeda ,  Mitsuzo Arii

发明人： Kazushi Shirai ,  Toshihiko Takano ,  Norio Takeda ,  Mitsuzo Arii

IPC分类号： G02B27/28 ,  G02F1/09 ,  H01S3/00 ,  G02B5/30

CPC分类号： G02F1/093 ,  G02F2203/06 ,  H01S3/0064 ,  Y10S372/703

摘要： An optical isolator comprises two birefringent plates one of which separates two light components whose planes of polarization are perpendicular to each other to make the two light components spatially separate between the two birefringent plates and pass through two separate optical paths and the other of which thereafter combines the two separate light components, two Faraday rotators disposed between the two birefringent plates and having a Faraday rotation angle of approximately 45 degrees, a polarizer disposed between the two Faraday rotators and having a predetermined polarized-light transmitting angle, and a magnetic field device for applying an external magnetic field to the two separate optical paths in the two Faraday rotators to magnetize respective regions near the two optical paths in each of the rotators in opposite magnetization directions to each other. In this arrangement two light components entering the polarizer in the forward direction has the same angle of plane of polarization as the predetermined polarized-light transmitting angle of the polarizer so as to pass through the polarizer, but two light components entering the polarizer in the reverse direction has an angle of plane of polarization perpendicular to the predetermined polarized-light transmitting angle of the polarizer so as not to pass through the polarizer. The high performance polarization-independent optical isolator may be obtained with high isolation of more than 50 dB, which is easy in assembling or manufacturing.

摘要翻译： 光隔离器包括两个双折射板，其中一个分离出两个彼此垂直的平面彼此垂直的光分量，使得两个光分量在两个双折射板之间在空间上分离并通过两个单独的光路，而另一个光组件之后组合 两个独立的光分量，两个分别位于两个双折射板之间并具有约45度的法拉第旋转角的法拉第旋转器，设置在两个法拉第旋转器之间并具有预定偏振光透射角的偏振片，以及用于 将外部磁场施加到两个法拉第转子中的两个分离的光路中，以使彼此相反的磁化方向的每个旋转体中的两个光路附近的各个区域磁化。 在该布置中，向前方向进入偏振器的两个光分量具有与偏振器的预定偏振光透射角相同的偏振平面角，以便穿过偏振器，但两个光分量相反地进入偏振器 方向具有垂直于偏振器的预定偏振光透射角的偏振平面的角度，以便不通过偏振器。 可以获得高达50dB的高隔离度的高性能偏振无关光隔离器，这在组装或制造中容易。

公开(公告)号：US5278853A

公开(公告)日：1994-01-11

申请号：US889469

申请日：1992-05-27

申请人： Kazushi Shirai ,  Makoto Sumitani ,  Norio Takeda ,  Mitsuzo Arii

发明人： Kazushi Shirai ,  Makoto Sumitani ,  Norio Takeda ,  Mitsuzo Arii

IPC分类号： G02B27/28 ,  G02B6/26 ,  G02B6/42 ,  G02F1/09 ,  H01S3/00

CPC分类号： G02B6/2746 ,  G02B6/4208 ,  G02F1/093 ,  G02F2201/16 ,  G02F2203/06 ,  Y10S372/703

摘要： A high quality small-sized polarization independent optical isolator for use in an optical fiber communication system, wherein a pair of magneto-optical elements having Faraday rotation angle of 45.+-.5 are contained in permanent magnets and arranged between a pair of birefringent crystal plates for splitting and combining an optical path of a laser light, and two polarizers arranged in parallel as being bounded on the midpoint of separated optical paths are interposed between the pair of magneto-optical elements, whereby a degree of worsening the optical isolation can be kept minimum against variations of an environmental temperature and wave length.

摘要翻译： 一种用于光纤通信系统的高质量的小尺寸偏振独立光隔离器，其中具有法拉第旋转角度为45±5的一对磁光元件包含在永磁体中，并且布置在一对双折射晶体板 用于分离和组合激光的光路，并且两个平行排列的偏振器被限定在分离的光路的中点上，插入在一对磁光元件之间，从而可以保持光隔离度的恶化 最小对环境温度和波长的变化。

公开(公告)号：US5091986A

公开(公告)日：1992-02-25

申请号：US610680

申请日：1990-11-08

申请人： Mitsuzo Arii ,  Norio Takeda ,  Shigeo Kataoka ,  Osamu Kondoh ,  Kuniaki Jinnai ,  Hisashi Ohwada ,  Tomoko Kondoh

发明人： Mitsuzo Arii ,  Norio Takeda ,  Shigeo Kataoka ,  Osamu Kondoh ,  Kuniaki Jinnai ,  Hisashi Ohwada ,  Tomoko Kondoh

IPC分类号： G02B6/122 ,  G02B6/125 ,  G02B6/28 ,  G02B6/30

CPC分类号： G02B6/30 ,  G02B6/125 ,  G02B6/2808

摘要： An optical divider for multimode optical fibers of graded-index (GI) type composed of an optical input section for securing input optical fiber, a branching section including an optical waveguide having rectangular sectional shapes irrespective of a kind of material or a method of fabricating the same and consists of a main optical waveguide and branch waveguide, and an optical output section for securing an array of output optical fibers, wherein the main optical waveguide having a width D and a length M is divided contiguously into N branch optical waveguides, preferably three or more having uniform width W, the optical waveguide having substantially uniform core thickness T is specifically related with the core diameter K of the otpical fiber to fufull the following relational formulas:0.7.ltoreq.T/K.ltoreq.0.85 (1)0.35.ltoreq.W/K.ltoreq.0.80 (2)15.ltoreq.M/D.ltoreq.70 (3)D=N.times.W (4)for reducing a coupling loss between the optical fibers and the optical waveguide and improved a loss variance by selecting the value of M/D to the value within the range as specified above or more preferably within a range of 20.ltoreq.M/D.ltoreq.60.

公开(公告)号：US06411641B1

公开(公告)日：2002-06-25

申请号：US09370926

申请日：1999-08-10

申请人： Kazushi Shirai ,  Norio Takeda

发明人： Kazushi Shirai ,  Norio Takeda

IPC分类号： H01S308

CPC分类号： G02F1/093 ,  H01S3/0064 ,  Y10S372/703

摘要： A high-energy laser Faraday rotator is used in an optical system in which the Faraday rotator absorbs laser light energy of more than 20 mW. The Faraday rotator includes a bismuth-substituted rare-earth iron garnet single crystal film grown as a Faraday rotator by using a liquid phase epitaxial method, and non-magnetic substrate having a side surface on which the bismuth-substituted rare-earth iron garnet single crystal film is formed.

摘要翻译： 高能激光法拉第旋转器用于其中法拉第转子吸收大于20mW的激光能量的光学系统中。 法拉第旋转器包括通过使用液相外延法生长为法拉第旋转器的铋取代的稀土铁石榴石单晶膜和具有铋取代的稀土铁石榴石单面的侧表面的非磁性基板 形成晶体膜。

公开(公告)号：US5925474A

公开(公告)日：1999-07-20

申请号：US939446

申请日：1997-09-29

申请人： Kazushi Shirai ,  Norio Takeda

发明人： Kazushi Shirai ,  Norio Takeda

IPC分类号： G02F1/09 ,  C30B29/28 ,  G02B1/02 ,  G02F1/00 ,  H01F10/24 ,  H01F41/28 ,  G11B5/66

CPC分类号： H01F10/245 ,  G02F1/0036 ,  H01F41/28 ,  Y10S428/90 ,  Y10T428/26

摘要： A BIG film for a Faraday rotator is provided with a first antireflection film on the front surface and a second antireflection on the back surface. The first and second antireflection films differ in material or thickness and therefore differ in color. The difference in color makes it possible to visually distinguish the front surface from the back surface. The antireflection films of different colors may be applied to a BIG film with a square hysteresis which retains its magnetic saturation after an external magnetic field has been removed.

摘要翻译： 用于法拉第旋转器的大片膜在前表面上设置有第一抗反射膜，在背面上设置第二抗反射膜。 第一和第二抗反射膜的材料或厚度不同，因此颜色不同。 颜色的差异使得可以在视觉上区分前表面和后表面。 不同颜色的防反射膜可以施加到具有平方滞后的BIG膜，其在去除外部磁场之后保持其磁饱和。

公开(公告)号：US5898516A

公开(公告)日：1999-04-27

申请号：US867497

申请日：1997-06-02

申请人： Kazushi Shirai ,  Norio Takeda ,  Kiyonari Hiramatsu

发明人： Kazushi Shirai ,  Norio Takeda ,  Kiyonari Hiramatsu

IPC分类号： G02F1/09 ,  C30B19/12 ,  C30B29/28 ,  G01R33/032 ,  G02F1/00

CPC分类号： G01R33/0322

摘要： A Faraday rotator is formed of a bismuth-substituted iron garnet single crystal film grown by a liquid phase epitaxial method. The single crystal film is represented by a formula: Tb.sub.3-x Bi.sub.x Fe.sub.5-y-z Ga.sub.y Al.sub.z O.sub.12 wherein x has the range 1.1.ltoreq.x.ltoreq.1.5, y+z has the range 0.65.ltoreq.y+z.ltoreq.1.2, and z has the range z.ltoreq.y. The bismuth-substituted rare earth single crystal film is subjected to a magnetization process where the single crystal film is magnetized by an external magnetic field so that the film has a square magnetic hysteresis loop. The external magnetic field has a magnetic field strength of 1,000 Oe or higher and is applied in a direction normal to a surface of the bismuth-substituted rare earth iron garnet single crystal film.

摘要翻译： 法拉第旋转器由通过液相外延法生长的铋取代的铁石榴石单晶膜形成。 单晶膜由下式表示：Tb3-xBixFe5-y-zGayAlzO12，其中x具有1.1×1.6的范围，y + z具有范围0.65

公开(公告)号：US5683506A

公开(公告)日：1997-11-04

申请号：US664416

申请日：1996-06-17

申请人： Kazushi Shirai ,  Norio Takeda

发明人： Kazushi Shirai ,  Norio Takeda

IPC分类号： G02F1/09 ,  C30B19/02 ,  C30B19/10 ,  C30B29/28 ,  C30B33/00 ,  G02B27/28 ,  C30B19/04

CPC分类号： C30B19/02 ,  C30B29/28 ,  C30B33/00

摘要： A method of manufacturing a bismuth-substituted rare-earth iron garnet single crystal film used for short wavelengths, includes the steps of: manufacturing a BIG-grown substrate in an LPE furnace by the LPE method, the BIG-grown substrate having a bismuth-substituted rare-earth iron garnet single crystal film grown on one surface of a non-magnetic garnet single crystal substrate, the film having a thickness in the range of 20-100 .mu.m; spinning the BIG-grown substrate at a high speed to remove a melt adhering thereto prior to taking the BIG-grown substrate out of the LPE furnace; and cooling the BIG-grown substrate to 300.degree. C. within one minute.

摘要翻译： 制造用于短波长的铋取代的稀土铁石榴石单晶膜的方法包括以下步骤：通过LPE法在LPE炉中制造BIG生长衬底，BIG生长衬底具有铋 - 在非磁性石榴石单晶衬底的一个表面上生长的取代的稀土铁石榴石单晶膜，该膜的厚度在20-100μm的范围内; 在将BIG生长的衬底从LPE炉中取出之前，高速旋转BIG生长衬底以去除附着在其上的熔体; 并在一分钟内将BIG生长的衬底冷却至300℃。